#include<stdio.h>
int main()
{
    void action1(int,int),action2(int,int);
    char ch;
    int a=15,b=23;
    ch=getchar();
    switch (ch)
    {
    case 'a':
    case 'A':action1(a,b);
        break;
    case 'b':
    case 'B':action2(a,b);
        break;
    
    default:putchar('\a');
        break;
    }
    return 0;
}
    void action1(int x,int y)
    {
        printf("x+y=%d",x+y);
    }
     void action2(int x,int y)
    {
        printf("x*y=%d",x*y);
    }
